OUTLINE: Patients undergo harvesting of autologous bone marrow. A portion of the cells are treated ex vivo with sargramostim (GM-CSF) for 3 days. Patients then receive myeloablative chemotherapy with busulfan and cyclophosphamide on days -9 to -2 according to the preparative regimen protocol. Patients undergo sargramostim (GM-CSF)-treated autologous bone marrow transplantation on day 0. Patients receive GM-CSF subcutaneously daily on days 5-180, and interferon alfa daily on days 90-180. Patients are followed monthly for 1 year, every 6 months for 2 years, and then annually for 3 years.